CVE-2026-33658: CWE-770: Allocation of Resources Without Limits or Throttling in rails activestorage
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
AI Analysis
Technical Summary
Rails Active Storage versions before 8.1.2.1, 8.0.4.1, and 7.2.3.1 allow an attacker to craft HTTP Range headers with an excessive number of byte ranges. The proxy controller processes these ranges without imposing limits, resulting in high CPU consumption disproportionate to the requested file size. This resource exhaustion can cause a denial-of-service impact. The vulnerability is tracked as CWE-770 (Allocation of Resources Without Limits or Throttling). Patched versions have been released to address this issue.
Potential Impact
The vulnerability can cause denial-of-service by exhausting CPU resources on the server when processing HTTP requests with many small byte ranges. This can degrade service availability for legitimate users. The CVSS 4.0 base score is 2.3, indicating low severity, primarily due to the limited impact scope and required privileges (low privileges needed). There are no known exploits in the wild.
Mitigation Recommendations
Upgrade Rails Active Storage to version 8.1.2.1, 8.0.4.1, or 7.2.3.1 or later, where the vulnerability is patched. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor advisory information embedded in the description.
CVE-2026-33658: CWE-770: Allocation of Resources Without Limits or Throttling in rails activestorage
Description
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Rails Active Storage versions before 8.1.2.1, 8.0.4.1, and 7.2.3.1 allow an attacker to craft HTTP Range headers with an excessive number of byte ranges. The proxy controller processes these ranges without imposing limits, resulting in high CPU consumption disproportionate to the requested file size. This resource exhaustion can cause a denial-of-service impact. The vulnerability is tracked as CWE-770 (Allocation of Resources Without Limits or Throttling). Patched versions have been released to address this issue.
Potential Impact
The vulnerability can cause denial-of-service by exhausting CPU resources on the server when processing HTTP requests with many small byte ranges. This can degrade service availability for legitimate users. The CVSS 4.0 base score is 2.3, indicating low severity, primarily due to the limited impact scope and required privileges (low privileges needed). There are no known exploits in the wild.
Mitigation Recommendations
Upgrade Rails Active Storage to version 8.1.2.1, 8.0.4.1, or 7.2.3.1 or later, where the vulnerability is patched. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor advisory information embedded in the description.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-23T15:23:42.219Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69c5a54b3c064ed76fcfc821
Added to database: 3/26/2026, 9:29:47 PM
Last enriched: 4/3/2026, 1:11:05 PM
Last updated: 5/11/2026, 6:53:28 AM
Views: 102
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